Baby measuring ahead?

Betty • Sat, Mar 21 2015 •

So I am, according to my doctor and LMP 15w6d. I had an ultrasound today @ the ER (went in for really bad UTI) anyway the tech told me the baby is measuring at exactly 17 weeks. What do I do? I have an apt. With my OBGYN in about a week but for the time being, do I change my due date?